Add toString to reporters

[Ithildir]

Resolves #402

Signed-off-by: Andrea Di Giorgi andrea.digiorgi@joinhoney.com

[codecov]

Codecov Report

Merging #403 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #403      +/-   ##
==========================================
+ Coverage    98.8%   98.81%   +<.01%     
==========================================
  Files          50       50              
  Lines        2013     2023      +10     
  Branches      379      379              
==========================================
+ Hits         1989     1999      +10     
  Misses         24       24

Impacted Files	Coverage Δ
src/reporters/in_memory_reporter.js	100% <100%> (ø)	⬆️
src/reporters/remote_reporter.js	95.74% <100%> (+0.18%)	⬆️
src/reporters/logging_reporter.js	100% <100%> (ø)	⬆️
src/reporters/noop_reporter.js	90% <100%> (+2.5%)	⬆️
src/reporters/composite_reporter.js	100% <100%> (ø)	⬆️

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[yurishkuro]

Thank you!